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Income Taxes - Summary of Net Deferred Tax Asset Reported in Other Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Income Tax Disclosure [Abstract] |  |
Provision for loan losses | $ 18,748 | $ 16,110
Write-downs of other real estate owned | 769 | 1,252
Deferred compensation | 3,197 | 3,108
Stock-based compensation | 2,441 | 3,201
Investments in partnership interests | 4,603 | 3,651
Other | 666 | 917
Gross deferred tax assets | 30,424 | 28,239
Unrealized net gains on securities | (59) | (962)
Premium on securities of banks acquired | (453) | (563)
Intangibles | (5,365) | (5,575)
Basis difference related to tax credits | (3,435) | (2,689)
Depreciation | (6,758) | (6,449)
Leveraged lease | (1,408) | (1,671)
Other | (271) | (606)
Gross deferred tax liabilities | (17,749) | (18,515)
Net deferred tax asset | $ 12,675 | $ 9,724

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